Summary
Using laser excitation spectroscopy of the luminescence lines of pure GaAs, we report the first observation of the oscillatory behaviour of the effective electronic temperature with LO phonons. This phenomenon leads to complementary oscillations of electron and exciton populations through temperature-dependent exciton formation. Varying exciton temperature permits to distinguish the luminescence arising from the two branches of the polariton.
Riassunto
Usando la spettroscopia di eccitazione laser delle righe di luminescenza del GaAs puro, si riportano le prime osservazioni del comportamento oscillatorio della temperatura elettronica effettiva dovuta a fononi LO. Questo fenomeno porta a oscillazioni complementari delle popolazioni di elettroni ed eccitoni attraverso la formazione di eccitoni dipendente dalla temperatura. Variando la temperatura eccitonica è possibile distinguere la luminescenza dovuta ai due rami del polaritone.
Резюме
Используя спектроскопию люминесдентных линий, возбужденных лазером в чистом GaAs, мы впервые обнаружили осцилляторное поведение эффективной электронной температуры в случае LO фононов. Это явление приводит к дополнительным осцилляциям заселенностей электронов и экситонов, связанным с образованием экситона, зависящего от температуры. Изменение экситонной температуры позволяет различить люминесценцию, возникаюшую от двух ветвей полярона.
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Footnotes
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A. Donzel andC. Weisbuch:Opt. Comm.,17, 153 (1976).
Performing the excitation spectra of GaAs with a pulsed dye-laser,Shah et al. (J. Shah, C. Lin, R. F. Leheny andA. E. Di Giovanni:Sol. State Comm.,18, 487 (1976)) did not observe the oscillation ofT e. This may be due to their higher excitation level, which might lead to τee<τLO.
The oscillation of various luminescence lines was also independently reported byB. Moreth: Diplomarbeit (Frankfurt, 1973), unpublished.
D. M. Eagles:Journ. Phys. Chem. Sol.,16, 76 (1960).
R. Ulbrich:Phys. Rev. B,8, 5719 (1973).
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This provides an alternative explanation to the shift of the maximum of the UBP emission reported in ref. (13)D. Bimberg andH. J. Queisser:Proceedings of the XI International Conference on the Physics of Semiconductors, Warsaw, 1972 (Warsaw, 1972), p. 157. and attributed to the free-carrier screening. It is rather due to the increase of polariton temperature with increasing intensity.
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Paper presented at the «Taormina Research Conference on Recent Developments in Optical Spectroscopy of Solids», held in Taormina, September 1976.
Traduzione a cura della Redazione.
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Weisbuch, C. Photocarrier thermalization and polariton kinetics in GaAs by laser excitation spectroscopy. Nuov Cim B 39, 660–665 (1977). https://doi.org/10.1007/BF02725808
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DOI: https://doi.org/10.1007/BF02725808